Stretching and quenching of flamelets in premixed turbulent combustion

Journal Article · Sun Sep 01 00:00:00 EDT 1991 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(91)90126-V· OSTI ID:5634011

Meneveau, C ^[1]; Poinsot, T ^[2]

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1. Dept. of Mechanical Engineering, Johns Hopkins Univ., Baltimore, MD (US)
2. Lab. EM2C, CNRS, Ecolo Centrale de Paris, 92295 Chatenay-Malabry Cedex (FR)

This paper reports on the stretch rate of flamelets in premixed turbulent combustion which is computed using detailed numerical simulations of vortex-flame interactions and a model for intermittent turbulence taking into account all possible turbulence scales acting on the flame front. Simulations of interactions between isolated vortices and a laminar flame front are used to obtain a relation between the characteristics of a given vortex and the actual flame stretch generated by this structure. Quenching conditions and quenching times are also given by these simulations. A net rate of stretch is then defined in the case of a complete turbulent flow field as the difference between the total rate of flame stretch and the quenching rate due to scales that have a high enough energy and a long enough lifetime to quench locally the flame front. The net rate of stretch is computed for a variety of parameters of interest in practical applications. It is a function of the large-scale turbulence parameters and the laminar flame speed and flame thickness and may be used as an input in most flamelet models for premixed turbulent combustion.

• OSTI ID: 5634011
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 86:4; ISSN CBFMA; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
DISPERSIONS
FLAMES
FLOW MODELS
FLUID FLOW
FUELS
KINETICS
LAMINAR FLOW
MATHEMATICAL MODELS
MIXTURES
PARAMETRIC ANALYSIS
REACTION KINETICS
TURBULENT FLOW
VORTEX FLOW